OracleJsonParser (Oracle Database JDBC Java API Reference)

All Superinterfaces:: AutoCloseable, Closeable

public interface OracleJsonParser
extends Closeable

Reads a JSON type value from an input source as a stream of events. Call next() to advance the parser to the next event in the stream and use accessor methods such as getString() and getInt() to access the data associated with the current event.

Example:


  import java.io.ByteArrayOutputStream;
  import java.nio.ByteBuffer;
  
  import oracle.sql.json.OracleJsonFactory;
  import oracle.sql.json.OracleJsonGenerator;
  import oracle.sql.json.OracleJsonParser;
  import oracle.sql.json.OracleJsonParser.Event;
  
  public class JsonParserExample {
    public static void main(String[] args) {
      OracleJsonFactory factory = new OracleJsonFactory();
      
      // Generate binary JSON value {"hello":"world","arr":[1,2]}
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      OracleJsonGenerator generator = factory.createJsonBinaryGenerator(out);
      generator.writeStartObject();
      generator.write("hello", "world");
      generator.writeStartArray("arr");
      generator.write(1);
      generator.write(2);
      generator.writeEnd();
      generator.writeEnd();
      generator.close();
      
      byte[] binaryJson = out.toByteArray();
      
      OracleJsonParser parser = factory.createJsonBinaryParser(ByteBuffer.wrap(binaryJson));
      while (parser.hasNext()) {
        Event e = parser.next();
        System.out.println(e);
        switch (e) {
        case START_OBJECT:
        case START_ARRAY:
        case END_ARRAY:
        case END_OBJECT:
          break; // do nothing
        case KEY_NAME:
          System.out.println(parser.getString());
          break;
        case VALUE_STRING:
          System.out.println(parser.getString());
          break;
        case VALUE_DECIMAL:
          System.out.println(parser.getBigDecimal());
          break;
        default:
          break;
        }
      }
      parser.close();
    }
  }

Running this example prints:

  START_OBJECT
  KEY_NAME
  hello
  VALUE_STRING
  world
  KEY_NAME
  arr
  START_ARRAY
  VALUE_DECIMAL
  1
  VALUE_DECIMAL
  2
  END_ARRAY
  END_OBJECT

Nested Class Summary

Nested Classes
Modifier and Type Interface and Description

static class OracleJsonParser.Event

Nested Classes
Modifier and Type	Interface and Description
`static class`	`OracleJsonParser.Event`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`close()` Closes the parser and closes any resources associated with it.
`OracleJsonArray`	`getArray()` Returns the current array value and advances the current state to the corresponding `END_ARRAY` event.
`BigDecimal`	`getBigDecimal()` Returns the current value as a decimal value.
`BigInteger`	`getBigInteger()` Returns a value equal to `getBigDecimal().toBigInteger()`.
`byte[]`	`getBytes()` Return the current binary value as a byte array
`void`	`getBytes(OutputStream out)` Return the current binary value to the specified output stream.
`double`	`getDouble()` Returns current event as a double.
`java.time.Duration`	`getDuration()` Return the current interval as a duration.
`float`	`getFloat()` Returns current event as a float.
`int`	`getInt()` Returns a value equal to getBigDecimal().intValue().
`java.time.LocalDateTime`	`getLocalDateTime()` Returns the current date or timestamp as a `LocalDateTime` value.
`long`	`getLong()` Returns a value equal to getBigDecimal().longValue().
`OracleJsonObject`	`getObject()` Returns the current object and advances the current state to the corresponding `END_OBJECT` event.\
`java.time.OffsetDateTime`	`getOffsetDateTime()` Returns the current timestamptz as an`OffsetDateTime` value.
`java.time.Period`	`getPeriod()` Return the current interval as a period.
`String`	`getString()` Gets a string for the current event.
`OracleJsonValue`	`getValue()` Return the value at the current parser event.
`boolean`	`hasNext()` Returns true if there are additional parsing events.
`boolean`	`isIntegralNumber()` Returns true if the current event is an integral number.
`OracleJsonParser.Event`	`next()` Return the next parsing event.
`void`	`skipArray()` Skips the current array value, advancing the parser to the corresponding `END_ARRAY`.
`void`	`skipObject()` Skips the current array value, advancing the parser to the corresponding `END_OBJECT`.
`<T> T`	`wrap(Class<T> wrapper)` Returns a JSON-P (javax.json.stream) wrapper around this value.

- Method Detail
  - hasNext
```
boolean hasNext()
```
    Returns true if there are additional parsing events.
    
    Returns:
    
    true if there are more parsing events.
    
    Throws:
    
    OracleJsonException - if an io error occurs
    
    OracleJsonParsingException - if the JSON is invalid
  - next
```
OracleJsonParser.Event next()
```
    Return the next parsing event.
    
    Returns:
    
    the next event
    
    Throws:
    
    OracleJsonException - if an io error occurs
    
    OracleJsonParsingException - if the JSON is invalid
    
    NoSuchElementException - if there are no more parsing events
  - getString
```
String getString()
```
    Gets a string for the current event. If the current event is KEY_NAME this method returns the key value.
    
    Returns:
    
    the string value
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_STRING, KEY_NAME, VALUE_DECIMAL, VALUE_DOUBLE, VALUE_FLOAT, VALUE_BINARY, VALUE_INTERVALDS, VALUE_INTERVALYM, VALUE_DATE, VALUE_TIMESTAMP, or VALUE_TIMESTAMPTZ
  - isIntegralNumber
```
boolean isIntegralNumber()
```
    Returns true if the current event is an integral number. Specifically, this method returns true when getBigDecimal().scale() is equal to 0.
    
    Returns:
    
    true if the current number is an integral number.
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getInt
```
int getInt()
```
    Returns a value equal to getBigDecimal().intValue().
    
    Returns:
    
    the int value
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getLong
```
long getLong()
```
    Returns a value equal to getBigDecimal().longValue().
    
    Returns:
    
    the long value
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getDouble
```
double getDouble()
```
    Returns current event as a double.
    
    Returns:
    
    the double
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getFloat
```
float getFloat()
```
    Returns current event as a float.
    
    Returns:
    
    the float
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getBigInteger
```
BigInteger getBigInteger()
```
    Returns a value equal to getBigDecimal().toBigInteger().
    
    Returns:
    
    the integer
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getBigDecimal
```
BigDecimal getBigDecimal()
```
    Returns the current value as a decimal value.
    
    Returns:
    
    the decimal
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DECIMAL, VALUE_DOUBLE, or VALUE_FLOAT
  - getOffsetDateTime
```
java.time.OffsetDateTime getOffsetDateTime()
```
    Returns the current timestamptz as anOffsetDateTime value.
    
    Returns:
    
    the offset date time
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_TIMESTAMPTZ
  - getLocalDateTime
```
java.time.LocalDateTime getLocalDateTime()
```
    Returns the current date or timestamp as a LocalDateTime value.
    
    Returns:
    
    the local date time
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_DATE or VALUE_TIMESTAMP
  - getPeriod
```
java.time.Period getPeriod()
```
    Return the current interval as a period.
    
    Returns:
    
    the period
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_INTERVALYM
  - getDuration
```
java.time.Duration getDuration()
```
    Return the current interval as a duration.
    
    Returns:
    
    the duration
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_INTERVALDS
  - getBytes
```
byte[] getBytes()
```
    Return the current binary value as a byte array
    
    Returns:
    
    the byte array
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_BINARY.
  - getBytes
```
void getBytes(OutputStream out)
```
    Return the current binary value to the specified output stream.
    
    Throws:
    
    IllegalStateException - if the current event is not VALUE_BINARY.
  - getValue
```
OracleJsonValue getValue()
```
    Return the value at the current parser event. If the current event is START_ARRAY, the result is the same as call to getArray(). If the current event is START_OBJECT, the result is the same as a call to . In other cases, the current value is read and returned.
    
    Returns:
    
    the value
    
    Throws:
    
    IllegalStateException - if the current event is END_OBJECT or END_ARRAY
  - getArray
```
OracleJsonArray getArray()
```
    Returns the current array value and advances the current state to the corresponding END_ARRAY event.
    
    Returns:
    
    the array value
    
    Throws:
    
    IllegalStateException - if the current event is not START_ARRAY
  - getObject
```
OracleJsonObject getObject()
```
    Returns the current object and advances the current state to the corresponding END_OBJECT event.\
    
    Returns:
    
    the object value
    
    Throws:
    
    IllegalStateException - if the current event is not START_OBJECT
  - skipArray
```
void skipArray()
```
    Skips the current array value, advancing the parser to the corresponding END_ARRAY.
    
    Throws:
    
    IllegalStateException - if the current event is not START_OBJECT
  - skipObject
```
void skipObject()
```
    Skips the current array value, advancing the parser to the corresponding END_OBJECT.
    
    Throws:
    
    IllegalStateException - if the current event is not START_OBJECT
  - wrap
```
<T> T wrap(Class<T> wrapper)
```
    Returns a JSON-P (javax.json.stream) wrapper around this value. For example:
```
    
      import javax.json.stream.JsonParser;
      ...
      OracleJsonParser oraParser = ...;
      JsonParser parser = oraParser.wrap(JsonParser.class); 
    
    
```
    The returned object is a logical view of this generator. Any changes to the state of this parser are observed by the returned wrapper object.
    Parameters:
    
    wrapper - the interface to view this object as. Must be assignable to javax.json.stream.JsonParser
    
    Returns:
  - close
```
void close()
```
    Closes the parser and closes any resources associated with it.
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Throws:
    
    OracleJsonException - if an i/o error occurs

Interface OracleJsonParser

Nested Class Summary

Method Summary

Method Detail

hasNext

next

getString

isIntegralNumber

getInt

getLong

getDouble

getFloat

getBigInteger

getBigDecimal

getOffsetDateTime

getLocalDateTime

getPeriod

getDuration

getBytes

getBytes

getValue

getArray

getObject

skipArray

skipObject

wrap

close